Dixon & Jory—On Some Minute Organisms. 749 
Difflugia in form and size. They were also incrusted with minute 
granules of transparent sand. We figure it here, as it may possi- 
bly be found to be a stage in the reproduction of Difflugia. If 
this turn out to be correct, it is a catena of Difflugia similar to 
what is well known as occurring in Ceratium tripos. Of course 
this is mere speculation, as we have not yet had opportunity of 
seeing the further development of this unknown structure, if 
further development it has. 
Besides the tests or loricee of the Difflugia, the tests of several 
other protozoa are found in the surface-water of the locality. 
The most numerous of these was, perhaps, Tintinnus campanula, 
a beautiful bell-shaped infusorian. The test, like that of Difflu- 
gia, is inlaid with particles of sand. These are, asa rule, much 
thinner than those on Difflugia. We never found a coccolith in 
the test of this infusorian. When found, the test was most 
usually empty ; however, on several occasions, we found it tenanted 
by the living infusorian, which exhibited all the characteristic 
energetic motions of the genus. 
Again very frequent in occurrence were other small tests 
resembling that of Difflugia in shape, except that they were not 
constricted at the aperture, and had no distinct collar. There 
were at least two species of these, one tapering almost uniformly 
from the widest place (fig. 7), and the other slightly constricted 
above the widest place, and then slightly expanding again, to 
finally taper toa delicate point. Both these tests were occasionally 
found inhabited by a heterotrichan infusorian. The latter seems 
identical with Tintinnus annulatus, as described by Claparéde and 
Lachmann. The former (fig.7) we propose to call Tintinnus conicus. 
Of the Foraminifera we found many examples, notably speci- 
mens which appear to be Rotalia veneta, Globigerina bulloides, 
Milliola, sp., Textulania picta. 
The Diatoms were very varied; among the more interesting 
were the following :—Actinocyclus undulatus, Actinoptychus sena- 
rius, Coscinodiscus radiatus, Melosira nummuloides, Arachnodiscus, 
sp., Pleurosigma, several sp., Cheetoceras, 2 sp. 
Another group, which was very numerously represented in 
the surface-water, was the Peridinese. Ceratiwm tripos vied with 
Diffugia thalassia to outnumber it in the plankton of the locality. 
Besides C. tripos (fig. 11) and its variety macroceras, C. fusca, C. 
